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        <title>第十二课 DOM（什么是DOM）</title>
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                <li>文本1</li>
                <li>文本2</li>
                <li>文本3</li>
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                <a href="###" title="超链接1">超链接1</a>
                <a href="###">超链接2</a>
                <a href="###">超链接3</a>
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